This study aims to investigate the effects of product and process innovations on manufacturing firm performance in Southeast Asian emerging markets. To this end, using a cross-national sample of 2324 manufacturing firms from the World Bank Enterprise Survey (WBES) dataset of 2015, we test the effects of product and process innovations on the sales growth of manufacturing firms in Vietnam, Malaysia, and Indonesia. This study finds that product innovation is positively related to sales growth while new operating technologies are negatively associated with sales growth. For high-tech firms, product innovation is positively related to sales growth. The findings imply that in Southeast Asian emerging markets, governments and manufacturing firms can enhance performance by investing in product innovation.